I think my request was not clear, because of my bad english. I for sure have searched and makes my tiny brain work a little bit before posting here.
An example might be clearer:
If I have cells (in "on" state) in my matrixctrl, says, at position 1 1, 3 7, 2 1 ….
When I bang the object, it outputs:
1 1 1
3 7 1
2 1 1
….
What I want is to have a time gap between each of these lists, not a general delay.
Something like:
(bang the matrixctrl)
1 1 1
(100 milliseconds wait)
3 7 1
(100 milliseconds wait)
2 1 1

If you [zl group] the output into one list, you can [zl slice 3] the first point and feed the other outlet into a [zl reg] and [del] as mentioned above then patch this back into the input of [zl slice] creating a loop.